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<span style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>The 13 Weather Service (NWS) River Forecast Centers (RFC) produce Quantitative Precipitation Estimates (QPE) for their individual RFC areas. The RFCs produce the data using a multi-sensor approach utilizing NWS 88D radar estimates of precipitation, automated and manual precipitation gauges and satellite estimates of precipitation. These QPEs are used as input into their hydrologic models to produce NWS river forecasts and guidance products. The QPEs from each RFC are combined into a single mosaic to create a QPE product that covers the lower 48 states, Alaska and Puerto Rico. These QPE 's measuring units are in inches. The data are on an approximate 4km x 4km grid cell scale. </span><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>The individual hourly data products (labeled Since 12Z Observed and those labeled Last X hours) contain data for the labeled time frame. These products are updated every hour to incorporate the most recent data.</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>The individual daily data products (Today's Analysis Observed, those labeled Last X Days Observed, and those labeled X To Date Observed.) represent a 24 hour total ending at 12UTC on the indicated date. These 24-hour data are then summed together to produce multi-day precipitation totals. Normal precipitation data are also produced for the Today's Analysis Observed and multi-day summations of 7 days or greater using data from the PRISM Climate Group. Percent of normal and departure from normal comparisons are also available by comparing the QPE data with the PRISM normal data. The daily data may be updated several times between 12UTC and 21UTC each day as updated data becomes available.</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Link to graphical web page: <a href='https://water.weather.gov/precip/index.php' rel='nofollow ugc'>https://water.weather.gov/precip/index.php</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Link to data download (Advanced Hydrologic Predictive Services (AHPS) Precipitation Downloads): <a href='https://water.weather.gov/precip/download.php' rel='nofollow ugc'>https://water.weather.gov/precip/download.php</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Links to metadata:</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml' rel='nofollow ugc'>Observed</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/NormalPrecip.xml' rel='nofollow ugc'>Normal</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml' rel='nofollow ugc'>Departure from Normal</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml' rel='nofollow ugc'>Percent of Normal Precipitation</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Questions/Concerns about the service, please contact the <a href='mailto:[e-mail]' rel='nofollow ugc'>DISS GIS</a> team</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><span style='font-weight:bold;'>Time Information:</span></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>This service is not time enabled</p>

13家美国国家气象局（National Weather Service, NWS）下属的河流预报中心（River Forecast Centers, RFC）会为各自负责的辖区生成定量降水估计（Quantitative Precipitation Estimates, QPE）产品。各RFC采用多传感器融合方案生成该数据：融合NWS 88D天气雷达降水反演结果、自动与手动雨量计观测数据，以及卫星降水反演产品。此类QPE产品将作为输入参数接入水文模型，用于生成NWS河道预报及相关指导产品。各RFC生成的QPE数据会被拼接为单幅镶嵌图，形成覆盖美国本土48州、阿拉斯加及波多黎各全境的QPE产品。该数据的计量单位为英寸，采用约4km×4km的网格单元尺度。

标注为“12Z以来观测”与“过去X小时”的单幅每小时数据产品，涵盖对应标注时段内的观测数据。此类产品每小时更新一次，以纳入最新观测数据。

标注为“今日观测分析”“过去X日观测”以及“当日至今观测”的每日数据产品，代表对应日期截至12UTC的24小时降水累计总量。将多组此类24小时降水总量数据累加，即可得到对应时段的多日降水累计总量。依托PRISM气候组（PRISM Climate Group）的观测数据，还可生成“今日观测分析”及7日及以上时长的多日降水累计总量对应的气候平均降水数据。通过将QPE数据与PRISM气候平均降水数据比对，还可获取降水距平百分率与降水距平值两类对比指标。每日数据会在每日12UTC至21UTC期间，根据新获取的观测数据多次更新。

可视化网页访问链接：https://water.weather.gov/precip/index.php

数据下载链接（高级水文预测服务（Advanced Hydrologic Predictive Services, AHPS）降水下载入口）：https://water.weather.gov/precip/download.php

元数据链接：
观测数据元数据：https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml
气候平均降水元数据：https://water.weather.gov/precip/metadata/NormalPrecip.xml
降水距平元数据：https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml
降水距平百分率元数据：https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml

若对本服务存在疑问或建议，请联系DISS GIS团队，邮箱：[e-mail]

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